<!--购物车添加商品和删除商品组件-->
<template>
  <div class="cartcontrol">
    <div class="cart-decrease " v-show="food.count > 0" 
      @click.stop.prevent="decreaseCart" transition="move">
      <span class="inner icon-remove_circle_outline"></span>
    </div>
    <div class="cart-count" v-show="food.count > 0">{{food.count}}</div>
    <div class="cart-add icon-add_circle" @click.stop.prevent="addCart"></div>
  </div>
</template>
<script type='text/ecmascript-6'>
    import Vue from 'vue';

    export default{      
      props: {
        food: {
          type: Object
        }
      },
      methods: {
        addCart(event) {
          //防止pc端点击bug
          if(!event._constructed){
            return;
          }
          if (!this.food.count) {
            //通过这个接口添加的属性变化可被检测到
            Vue.set(this.food, 'count', 1);
          }else{
            this.food.count++;
          }
          //派发一个事件 传出dom对象
          this.$dispatch('cart.add', event.target)
        },
        decreaseCart(event){
          if (!event._constructed) {
            return;
          }
          if (this.food.count) {
            this.food.count--;
          }
        }
      }
    }
</script>
<style lang='stylus' rel='stylesheet/stylus'>
  .cartcontrol
    font-size 0
    .cart-decrease
      display inline-block
      padding 6px
      transition all 0.4s linear
      &.move-transition 
        opacity 1
        transform translate3d(0, 0, 0)
      .inner
        display inline-block
        line-height 24px
        font-size 24px
        color rgb(0, 160, 220)
        transition all 0.4s linear
        transform rotate(0)
      &.move-enter,&.move-leave
        opacity 0
        transform translate3d(24px, 0, 0)
        .inner
          transform rotate(180deg)
    .cart-count
      display inline-block
      vertical-align top
      font-size 10
      width 12px
      padding-top 6px
      line-height 24px
      text-align center
      font-size 10px
      color rgb(147, 153, 159)
    .cart-add
      display inline-block
      padding 6px
      line-height 24px
      font-size 24px
      color rgb(0, 160, 220) 
</style>